Rotary drilling equipment



June 3 W24 1,496,256

w. D. DAVIDSON ROTARY DRI LL I NG EQUI PMENT Filed ApriL 19, 1923 Z Sheets-Sheet l Esme 3 9 i2% W. D. DAVIDSON ROTARY DRILLING EQUIPMENT 1923 2 Sheets-$heet 2 Filed April 19,

[rive/1 for mLL/Mfl Dav/1.75011 Patented June 3, I924.

OFFIE.

WILLIAM D. DAVIDSON, LOS ANGELES, CALIFORNIA, ASSIGNOR TO UNION TOOL COMPANY, OF TORRANCE, CALIFORNIA, A CORPORATION OF CALIFORNIA.

ROTARY DRILLING EQUIPMENT.

Application filed April 19, 1923.

To all whom it may concern:

Be it known that 1, WILLIAM D. Dnvroson, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles' and State of California, have invented a new and useful Rotary Drilling Equipment, of which the following is a specification.

This invention relates to rotary drilling equipment and refers particularly to a locking device for holding bushings in place in a rotary table.

An object of this invention is to provide the drill stem bushings with means for preventing accidental withdrawal of these bushings in raising the drilling stem.

Frequently in so raising the drilling stem one or both of the split drill stem bushings cling to the stem and are lifted from the hole in which they fit. It is then necessary to rotate the gear table back and forth until the bushings drop back in place. Since a close fit is required between the drill stem bushings and the table bushings into which they fit, and since the drilling stem frequently has a tendency to lean to one side,

Elie 1replacement of the bushings is very difcu t.

Another object of this invention is to provide a locking means which is extremely durable, simple and inexpensive in construction and readily installed and removed as desired.

Another object of this invention is to provide a locking means which may be readily supplied to such rotary drilling equipment as is now in use without requiring any material alteration in the same.

Further objects and advantages of this invention I will appear from the following description of the accompanying drawings which illustrate the preferred embodiment of the invention.

Figure 1 is a plan view of one embodiment of the invention showing a drill stem in section fitted into the drill stem bushings.

Fig. 2 is a side elevation partially in section as indicated by the line 22 of Figure 1.

Fig. 3 is a vertical section on the line- 3-3, Figure 2.

Fig. 4 is a perspective view of a locking bar employed in this embodiment of the invention.

Serial No. 633,255.

the opening 3 provided in the rotary table 4.

At both ends of said bar lugs or hooks 5 extend downwardly having fiat horizontal or slightly inclined faces 6. Both hooks 5 face in the same direction. Joined to a side of the bar portion 2 is provided a handle 7.

The rotary table and bushings may be any of a number of constructions well known in the art. In this embodiment there is shown a square opening 3 provided in the table 4. into which split table bushin s 10 are fitted. Into said table bushings are tted split drill stem bushings 11 in a manner well understood in the art. By my invention there are provided L-shaped slots 12 in the table whereb the hooks 5 of the bar 1 may be inserte in said slots and said bar abut at least a portion of the drill stem bushings 11. Said slots 12 necessarily comprise an opening and an under recess portion 13 providing an under face 14 which will be substantially in line and closely placed to the flat face 6 provided by the bar 1.

It can be seen that by inserting the lockin bar 1 into the slots 12 which are provi ed at each side of the square opening 3, the flat bottom of. said bar will abut the drill stem bushings 10 and preventsaid bushings 10 leaving their seats, the contact between the under face 14 of the rotary table and the aligned face 5 of the safety bar prevents the removal of the bar. Thus a simple and effective method of locking the bushings is provided. The handle 7 of the locking bar is provided at one side whereby said bar when lifted by the handle tends to rotate and disengage the hooks from the slots and is easily withdrawn from the table.

Referring to Figures 5, 6, and 7, I have illustrated a form of the invention which may be advantageously incorporated with such drilling outfits now in use Without requiring any alterations in the rotary table member 4.

For these purposes the L-shaped slots 12" are provided in the table bushing 10 and a locking bar 1 provided for inserting into said slots. Said bar is substantially a duplicate of the bar 1. having depending lugs or hooks 5 of similar construction thereto, but having a slightly shorter bar portion 2.

The locking bar l will operate similar to the bar 1, however the drill stem bushings 11 are locked thereby to the table bushings 10. said bushing 10 being of sufficient weight to practically eliminate any withdrawal of the stem bushing 11 by movement of the drilling stern.

It is understood that my invention is not limited in its application to any particular form of table or form of bushings but may readily be employed with widely difien ing table and bushing constructions.

My invention is of the scope set forth in the following claims.

I claim:

1. In a rotary drilling equipment, the combination of a rotary table, a split bushing loosely fitted in the central opening of said table, a locking bar abutting said bushing and provided at either end with depending hooks adapted to loosely fit in L-shaped slots to lock said bushing in place.

2. In a rotary drilling equipment, the combination of a rotary table, provided with a plurality of L-shaped slots, table bushing inserted in the central opening of said table, split drill stem bushings inserted in said table bushing, and a locking bar provided at either end with hooks fitting in said slots for locking said drill stem bushing in place.

3. A rotary drilling equipment comprising a rotary table having loosely fitted therein split table bushing and split drill stem bushing, and a bar abutting said split table bushing and provided at either end with hooks for locking Said bar in place.

4. A locking bar comprising a central bar portion, hooks depending from both ends said central portion, and a handle fitted thereto whereby said bar tends to rotate on being raised by said handle.

Signed at Torrance, Calif, this 12th day of April, 1923.

YVILLIAM D. DAVIDSON. 

